Gesellschaft fur elektrisciies liciit unt



(No Model.)

C. GOERPER.

ELBGTRO DYNAMIC MAGHINE,

No. 396,269. Patented Jan. 15, 1889.

A TTORNEYS WITNESSES:

,ties are experienced in starting or UNITED STATES CARL COERPER, OFCOLOGNE, PRUSS PATENT (IEEicE,

IA, ASSIGXOR TO THE HELIOS ACTIEN- EHRENFELD, GERMANY.

ELECTRO-DYNAMIC MACHlNE.

SPECIFICATION forming part of Letters Patent No. 396,269, dated January15, 1889.

Application filed February 15, 1888! Serial No. 264,077-

To all whom it may concern.-

Be it known that I, CARL COERPER, a subject of the King of Prussia,Emperor of Germany, residing at the city of Cologne, in the Kingdom ofPrussia, German Empire, have invented certain new and usefulImprovements in Dynamo-Machines, (for which Letters Patent heretoforewere granted to me by the governments of Belgium, dated January 12,1888, No. 80,249; England, dated January 14, 1888, No. 633; France,dated February 4, 1888, No. 188,555, and Italy, dated March 27, 1888,Vol. XXI, No. 22,992, and YoLXLIQNo. 297,) of which the following is aspecifieation.

In transmitting power by electricity greater or less difficulty isexperienced in starting the machines, especially in such cases where thepower is to be transmitted from high-speed dynamo-machines to shaftsrotated at low speed or at varying speedsas, for example, in startingand running street-cars, &c.

The object of my invention is to furnish an A improved construction ofdynamo-machine which is especially adapted for transmitting motion andpower, and in which no difficulstopping the car or other body to bedriven; and the invention consists in a dynamo-machine in which one ofthe elementseither the fieldmagnets or the armature-is rigidly mountedon the shaft to be driven, while the other element is loosely mounted onthe shaft and checked or entirely stopped by means of a brake or othersuitable checking device. IVhen the current is conducted into thedynamo, the field-magnets and armature will have a tendency to rotate inopposite direction to each other; but when one element is fixed on theshaft while the other element is loose the latter will rotate alone. henthe speed of rotation of the loosely-mounted element is decreased bymeans of the brake, it will have a tendency to impart motion to theelement fixed on the shaft and thereby turn the shaft. The motionimparted thereby to one element is increased when the brake is appliedmore firmly to the element which is mounted loosely 011 the axle untilthe latter is (No model.) Patented in Belgium January 12, 1888, No.80,249; in England January 14, 1888, No. 633; in France February 4,

1888 No.188 555 and in Ital March 27, 1888, XXI, 22,992,

1 r J Y held in rigid position by means of the brake, while the otherelement will have reached the maximum speed of rotation corresponding tothe current. For example, in a street-car in which one element ismounted on one of the axles and the other is loose on the axle, theloose element will have its maximum speed of rotation when the car is ata standstill, and as the brake is applied to said loose element thelixed element on the axle begins to turn slowly and the ear is propelledforward slowly, while as the power of the brake is increased the speedof the ear increases. 'lhus variations in the speed of the car can beobtained withoutrequiring any change in the strength of the current.

The field-magnet and armature can also both be looselymounted on theshaft or axle, and are then provided with brake orcheck devices, eitheron the axle or imlependent of the axle, so that their motion can becontrolled. In case one of the elements is mounted directly upon theaxle carrying the driving-wheels it is advisable to provide intermediateelastie or cushioned members to avoid jars or jolts. To reverse thedirection of the motion of the elements, all. that is necessary is tochange ihedireclion of the current to the armature. As both elements ofthe dynamo are in motion, but in an opposite direction to each other,the number of rotations of the dynamo can be reduced nearly oue half. Itis therei'ijn'e possible to use comparat-ivcly small dynamos with higheffect for driving shafts that do not need high speeds of rotation-suchas,t'or instance, the axles of street-cars.

My improved dynamo can also be used with great success where dynamos aredriven by shafts having varying speeds of rotation as, for example, inlighting railway-trains by electricity, as in such cases the dynamo isdriven from one of the axles of the cur.

\Vith my improved construction the electric potential can bemaintaineduniformly at different speeds, one of the elements being controlled inregard to its speed of rotation by a brake; or, it both thefield-magnets and armature are loosely mounted on the axle, saidelements can be controlled in. their speed of rotation by the brakedevices.

My improved system can be used with nearly all constructions of dynamos,but is especially adapted to those types in which both the field-magnetsand the armature are of ring shape. \Vhen both elements are of thisshape and synnnetrically arranged, considerable Variations in the speedof rotation and power can be obtained by a proper adjustment of thebrushes both in the fieldmagnets and the armature.

In the accompanying drawings, Figure 1 is a side View of adynamo-machine mounted on the axle in the manner described, showing thebrake in side View and the axle in section. Fig. 2 is a horizontalsectional View of the parts shown in Fig. 1.

Similar letters of reference indicate corresponding parts.

a represents the axle; b, the field-magnet; c, the armature having ahub, (I, with a bearing-sleeve, e, mounted loosely on the axle.

f represents the adjustable shoes of a fixed brake, f, by means of whichthe armature can be controlled in the manner described.

In case the armature is fixed and the fieldmagnets are mounted looselyon the axle,

to rotate with the field-magnets.

Having thus described my invention, I claim as new and desire to secureby Letters Patent-- 1. The combination, in a dynamo-machine for theelectrical transmission of power, of a shaft or axle, an armature andfield magnets on said shaft or axle, one of the elements of thedynamo-machine, either the armature or field-magnets, being looselymounted on the shaft or axle, and a brake or other cheek mechanismapplied to the loosely-mounted element and capable of locking the samein a position of rest, substantially as set forth.

2. In a dynamo-machine for the electrical transmission of power, thecombination, with a shaft or axle, of a field-magnet mounted rigidly onsaid shaft or axle, an armature ap plied loosely on the shaft or axle,and a brake or other cheek mechanism applied to the armature and capableof locking the same in a position of rest, substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CARL COERPER.

